standard concentration

By the critical concentration as a standard of the United States Committee for Clinical Laboratory Standards ( NCCLS), we used microdilution method to determine the resistance of Streptococcus suis against three kinds of tetracycline, which were doxycycline, tetracycline hydrochloride and chlortetracycline hydrochloride.

以美国临床检验标准委员会（NCCLS）的临界浓度做为判断标准，采用微量稀释法判定了猪链球菌对强力霉素、盐酸四环素、盐酸金霉素3种四环素类抗生素的耐药性。

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Formation cause analyses and control policy of over standard concentration of discharged boiler soot

锅炉烟尘排放浓度超标成因分析及控制对策

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Methods: The serum concentration of cefaclor was determined by microbiological method in 18 healthy volunteers after an oral dose of 500 mg standard or tested formulation in crossways.

方法：18名健康受试者随机交叉单剂量口服头孢克洛片标准参比制剂和被试制剂500mg，采用微生物法测定不同时间血清中药物浓度。

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Fatigue notch factor and theoretical stress concentration factor is used to modify the mean and standard error of fatigue strength respectively.

在综合考虑疲劳缺口系数和理论应力集中系数的影响下，对疲劳强度指数的均值和标准差分别进行修正，获得适用于高周构件的寿命预测公式。

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The half lethal concentration of 48? h-LC_ ( 50) of 21 nitrobenzenes to Daphnia carinata was determined by use of the standard test method, and the range of toxicity was from 3.49 for nitrobenzene to 5.40 for 1,4-dinitrobenzene.

采用标准实验方法测定了21种硝基苯类化合物对隆线蚤（Daphnia carinata）的48h半致死浓度值，结果lg（1/LC50）的范围在349～540之间；

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And under the optimal conditions, concentration of CoQ 10 that determinated with standard curve chart was 91.2 %.

经标准曲线法测定在最佳条件下,分离得到的辅酶Q10纯度较高, 达91.2%.

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The theoretical stress concentration factor K_t is the primary factor in defining the geometric parameters of standard specimens.

各国标准都以理论应力集中系数K t作为确定试样几何参数的主要依据。

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Piggery wastewater is heavy concentration organic wastewater, after anaerobic fermentation treatment, the most of organic pollutants in piggery wastewater has been removed, but it's difficult to be up to the discharge standard.

猪场废水属于高浓度有机废水，大多数猪场废水经过厌氧发酵后，其大部分有机污染物得到了去除，但很少能达标排放。人们在这方面开展了许多研究，均不能根本解决这一问题。

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Among some improvement, outside fresh air sends directly to those spots around cooking range and chef breathing section where pollutant concentration is beyond standard can meet oxygen requirement for gas combustion efficiently and dilute pollutant concentration there quickly;

以组合风幕送风方式将室外新风直接送到炉灶周围和厨师呼吸区污染物浓度超标部位，高效率地满足煤气燃烧需氧量要求、快速稀释超标部位污染物浓度；

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Along with the concentration of PMMA standard paniculate increased, apparent cutting rate increased a little.

随着PMMA标准微粒浓度的增加, 表观截留率略有增加.

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Based on both the modified clustering model and GM ( 1,1) model, the concentration threshold model of each pollutant is established to calculate the critical value with the environment aim at attaining the standard grade.

结合修正聚类分析模型及灰色预测GM（1,1）模型，建立了污染物达标浓度阈值计算模型，从而可确定系统内各因子在达标这个环境目标下的浓度临界值，即目标总量控制值。

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